<h3>MultiPoint</h3>
<ul>
    <li>使用 Buffer 缓冲区</li>
</ul>

<select [value]="baseGraph[0]" (change)="onSelectChange($event)">
    <option *ngFor="let item of baseGraph" [value]="item">{{item}}</option>
</select>

<div class="canvas-box">
    <canvas id="myCanvas" width="300" height="300"></canvas>
</div>